I'm using the ADE7878 for power monitoring and I have problems calibrating the IRMS.
I use current transformer with a CT of 2000. So I get the following value for IFS:
IFS = (0.5*2000) / (7,07 *SQR(2)) = 100.0151
My nominal current is 2.08A.
So I get an IrmsREF of 87179.
Without AIGAIN, the AIRMS register has the following value: 91500 (0.0915A).
I calculate AIGAIN: IrmsREF/IRMS -1 = (87179/2080000)-1)= -0.95808=0x855D67 and write 00855D67 to the AGAIN register.
Now with AGAIN the AIRMS register has the following value: 187259 (0.187259 A).
Where is the mistake?
Best regards Jens